Silver halide emulsions with average grain size around 10 nm and red-green-blue sensitivities were prepared.The influences of some preparing conditions on the emulsion grain size and spectral sensitivity were discussed.The emulsions were used to record holographic reflection gratings for investigating their properties in reflection holography.The reflection gratings were processed in a modified AAC developer and modified R-10 bleach.Diffraction efficiencies of the reflection gratings achieve 55 % for the exposure of 1.8 mJ/cm~2 at 633 nm,55 % for the exposure of 2.2 mJ/cm~2 at 515 nm and 50 % for the exposure of 3.3 mJ/cm~2 at 458 nm respectively.